​Return of incandescent light bulbs as MIT makes them more efficient than LEDs
Researchers at MIT have shown that by surrounding the filament with a special crystal structure they can bounce back the energy which is usually lost http://www.telegraph.co.uk/news/science/science-news/12093545/Return-of-incandescent-light-bulbs-as-MIT-makes-them-more-efficient-than-LEDs.html Harry
